Synthesis and application of citrate-covered water soluble CdS nanomaterial

A technology of citrate and nanomaterials, applied in the field of nanometers, can solve problems such as unsatisfactory light stability of quantum dots and shedding of mercapto compounds, and achieve the effects of easy control of production conditions, fast response and good luminescence performance

Inactive Publication Date: 2011-01-19
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the quantum dots prepared by mercapto compound modifiers have good fluorescence properties, the photostability of quantum dots modified by mercapto compounds is not ideal [Gaponik N, Talapin D V, Rogach A L, et al.J.Phys.Chem.B, 2002 , 106:7177-7185], mercapto compounds are easy to fall off from the surface under light

Method used

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  • Synthesis and application of citrate-covered water soluble CdS nanomaterial
  • Synthesis and application of citrate-covered water soluble CdS nanomaterial
  • Synthesis and application of citrate-covered water soluble CdS nanomaterial

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] a. Dissolve 9.0×10 in 40mL -4 mol L -1 CdCl 2 Add 0.8968 gram of trisodium citrate dihydrate in the aqueous solution, fully stir, make the precursor solution of Cd-Cit;

[0020] b. Use 1.0M sodium hydroxide solution to adjust the pH of the mixture to 8.5, and flush it with high-purity nitrogen for 30 minutes to remove the oxygen in the mixture;

[0021] c. Mix 10mL 2.0×10 -4 mol L -1 The sodium sulfide solution was added to the above precursor solution, and reacted at 90° C. for 15 minutes to obtain a water-soluble CdS nanometer material coated with trisodium citrate. The emission wavelength of the product prepared under this condition is 567nm.

Embodiment 2

[0023] a. Dissolve 1.0×10 in 40mL -4 mol L -1 CdCl 2 Add 1.1679 grams of tripotassium citrate monohydrate in the aqueous solution, fully stir, make the precursor solution of Cd-Cit;

[0024] b. Use 1.0M sodium hydroxide solution to adjust the pH of the mixture to 9.0, and flush it with high-purity nitrogen for 30 minutes to remove the oxygen in the mixture;

[0025] c. Mix 10mL 2.0×10 -4 mol L -1 The sodium sulfide solution was added to the above precursor solution, and reacted at 50° C. for 1 hour to obtain a water-soluble CdS nanomaterial coated with tripotassium citrate. The emission wavelength of the product prepared under this condition is 590nm.

Embodiment 3

[0027] a. Dissolve 2.0×10 in 40mL -4 mol L -1 CdCl 2 Add 0.8756 gram of ammonium citrate to the aqueous solution of Cd-Cit, fully stir, make the precursor solution of Cd-Cit;

[0028] b. Use 1.0M sodium hydroxide solution to adjust the pH of the mixture to 6.0, and flush it with high-purity nitrogen for 30 minutes to remove the oxygen in the mixture;

[0029] c. Mix 10mL 2.0×10 -4 mol L -1 The sodium sulfide solution was added to the above precursor solution, and reacted at room temperature for 1 hour to obtain a water-soluble CdS nanometer material coated with ammonium citrate. The emission wavelength of the product prepared under this condition is 572nm.

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Abstract

The invention provides a synthesis method and application of a citrate-covered water soluble CdS nanomaterial. The synthesis method comprises the following steps of: a, adding soluble citrate into solution of soluble salt in which cadmium ions are dissolved to prepare precursor solution of Cd-Cit; b, adjusting the pH value of the precursor solution with solution of sodium hydroxide, and removing oxygen from mixed solution by introducing an inert gas; and c, adding sodium sulfide into the mixed solution, and reacting for a certain period of time to obtain the citrate-covered water soluble CdS nanomaterial. A water soluble quantum dot with high dispersibility and high fluorescent performance can be obtained under mild conditions. The obtained quantum dot can be used for analysis and measurement of cysteine.

Description

Technical field: [0001] The invention relates to the field of nanotechnology, in particular to a synthesis method of water-soluble, citrate-coated CdS nanometer material; the invention also relates to the application of the material in analysis and detection. Background technique: [0002] It is well known that cysteine ​​(Cys) is an amino acid with a sulfhydryl group, which plays an important role in biological functions such as protein folding [W.H.Wang, O.Rusin, X.Y.Xu, K.K.Kim, J.O.Escobedo, S.O. Fakayode, K.A. Fletcher, M. Lowry, C.M. Schowalter, C.M. Lawrence, F.R. Fronczek, I.M. Warner, R.M. Strongin, J.Am.Chem.Soc. 127, (2005), 15949.]. The lack of Cys in the human body will cause many complications such as hair discoloration, edema, skin lesions, muscle weakness and so on. In view of the important role of Cys in organisms, its determination has attracted more and more attention [P.K.Sudeep, S.T.S.Joseph, K.G.Thomas, J.Am.Chem.Soc.127, (2005), 6516; H.Y.Shiu , H.C....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/56C09K11/02G01N21/64
Inventor 王光丽董玉明李在均
Owner JIANGNAN UNIV
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